“…Extracellular products of S. aureus have been shown to activate mouse lymphocytes to proliferation ( 5 , 9, I I , 15, 18, 23, 241, and protein A, a S. aureus cell wall component, is known to be a polyclonal activator of human B lymphocytes (1 0, 17,21,22). Recently attempts to analyze the capacity for lymphocyte activation of different S. aureus components have been made ( 6 , 7,8). The aim of this study was to characterize the activation of human lymphocytes induced by different strains of S. aweus and to investigate different methods for preparation of bacteria, in particular their watersoluble components.…”